package com.example.designPatten.observer.ObserverJavaAPI;

import com.example.designPatten.observer.ObserverJavaAPI.inter.DisplayElement;

import java.util.Observable;
import java.util.Observer;


public class HeatIndexDisplay implements Observer, DisplayElement {
	float heatIndex = 0.0f;

	public HeatIndexDisplay(Observable observable) {
		observable.addObserver(this);
	}

	public void update(Observable observable, Object arg) {
		if (observable instanceof WeatherData) {
			WeatherData weatherData = (WeatherData) observable;
			float t = weatherData.getTemperature();
			float rh = weatherData.getHumidity();
			heatIndex = (float) ((16.923 + (0.185212 * t)) + (5.37941 * rh)
					- (0.100254 * t * rh) + (0.00941695 * (t * t))
					+ (0.00728898 * (rh * rh)) + (0.000345372 * (t * t * rh))
					- (0.000814971 * (t * rh * rh))
					+ (0.0000102102 * (t * t * rh * rh))
					- (0.000038646 * (t * t * t))
					+ (0.0000291583 * (rh * rh * rh))
					+ (0.00000142721 * (t * t * t * rh))
					+ (0.000000197483 * (t * rh * rh * rh))
					- (0.0000000218429 * (t * t * t * rh * rh))
					+ (0.000000000843296 * (t * t * rh * rh * rh)) - (0.0000000000481975 * (t
					* t * t * rh * rh * rh)));
			display();
		}
	}

	public void display() {
		System.out.println("Heat index is " + heatIndex);
	}
}